Wide-angle eyepiece with long eye relief



JDUQQLU DH OR 3,233,513

1966 H. WAGNER ETAL 3, 3

WIDE-ANGLE EYEPIECE WITH LONG EYE RELIEF Filed Aug. 5, 1962 INVENTORS Helmuf WAGNER Ado/f STERLEPPER BY V'Mmv JIM 4 TTU R/VEYS United States Patent 3,233,513 WIDE-ANGLE EYEPIECE WITH LONG EYE RELIEF Helmut Wagner, Wetzlar (Lahn), and Adolf Sterlepper,

3,233,513 Patented F eb. 8, 1966 The several components of the eyepiece of this invention are constructed in the following manner.

The first component consists of two lenses one of which, preferably the first lens, which is the closest to the objecst id f, near w m (L h G assignol-s t 5 tive, has a light-collecting effect. This first lens may also Carl Zeiss-Stiftung, doing business as Carl Zeiss, Wurtcomprise a collecting meniscus lens the concave surface of temberg, Germany, a corporation of Germany which is directed toward the objective. The second lens l q Allg- 214,708 of the first component is a double concave lens. The first Claims pr1or1ty, appl1cat10n Grermany, Aug. 5, 1961 and second lenses of this first component can be cemented to ether. 1 1m. 1. 8-57 10 1 C a (C 8 The second component conslsts of a s1ngle llght-collect- The present invention relates to an optical lens system, lhg leh$ the Surface P Whleh dlreeted toward the ye more particularly, to an improvement i a wide angle havlng a smaller rad us of curvature than the surface d1- piece having an image angle of at least 60. rected toward the obleehve- Wide-angle eyepiecsgs having an image angle of at least The th rd component cons1sts of two lenses cemented to- 60 are already known but generally have the disadvangether f the lens dlreeted i the Objective having tage that the eye of the user is positioned so close to the a dlspe'rslhg effect- Thls lens 18 p t t cted as a meniscus last face of the lens of the eyepiece that the field of vision lens Wlth concave surface e dlrected tQWHTdS t i restricted h h user of h eyepiece Wears eye. The second lens of the third component is a double glasses. Thus, the known wide-angle eyepieces which can 20 Convex lehsb d b persons wearing eyeglasses can obtain only The fourth component consists of a single l1ghtcollectangies f images hi h are smaller than mg men1scus lens the concave surface of wh1ch is directed It is therefore the principal object of the present inventoward the ey i to id a novel d improved id l The relat1onsh1ps between the several lenses of the eyepieces h i an image angle greater h 6() p1ece are illustrated 1n greater detail in the accompanying The eyepiece of the present invention is so constructed dfawlhg- The lhdlvldual lenses are lh dieited 0111 1 so that the distance between the eye of the user and the throhgh vr- The y f t 1 1 r8 Indicated at {\P. last face of the lens of the eyepiece measured along the T Image P e of h l Image p le q y h l optical axis is greater than the focal length of the eyepiece. tlve used J mctlon w1th the y e 1S mdlcated a As a result of this relationship such an eyepiece may also The lfhage p h lhto whleh the dlsperslhg member be used by persons wearing eyeglasses without the necesof the y p P J al I age O is indicated at B. sity for restricting the field of vision under these condid lndicates the distance along the optical axis between tio the leading face of the first lens and the image plane 0 T e wide-angle eyepiece of the present invention esand d is the distance along the optical axis between the sehtiahy Comprises four Components Whleh are 21103113 eye of the user and the last face of the last lens of the aligned with respect to each other and which have spaces eyepiece therebetween. The first component has a d1spers h The numerical data for the eyepiece of the present infest and vqsltloned from. of h l Image prolefited vention are set forth in the following table wherein r by an g i used r 2 i e g 40 equals radius, d equals thicknesses as multiples of the focal Thus t e Tea Image Is (fl-me y a er 6 lg rays length 1 of the eyepiece. The reference symbols n n have passed through the d1spers1ng member. The second d ate the refractive i dexes f the ed h d 0 component is positioned at or in. the vicinity of this real m n o r y robe image and has a lightcollecting effect. The third and lme the yellow hehum lme and the blue hydrogen fourth components also have a light-collecting effect. hhe F, respectively- Lens Radius of Curvature Distance and no 128 me curvature spacmg 0 58931 (10 =-0.05094-/ 2- .7 M 16969 f f (I 0.19S30-f 1. 75300 1.70180 1.78190 r1 =1.01082-f 0.98932:f d 0 r =1.0lO82-f 0.98932:/ 2 L" 83036] (1 0.00107-/ 1. 48534 1. 48/49 1. 49230 1.- f 1 at 0.83070 B image plane 7 6 d5 0.02253 1 8"5' 0.000 5: L T5 64 H I f d5 0.7G220-f 1.50575 1.50883 1.57590 f (17 0.70025] 43493- 0.2911 L T7 +3 f d8 0.09295] 1. 77007 1. 78470 1.80013 r =+1.23544-f +0.80880:f d 0 9. 1.23044- 0.80880: Lv n f f d10= 0.81178-f 1.58518 1. 58784 1.59380 n5=3.10570-f 0.32l98:f

5176f d11= 0.229287 3 0.6 L +1 5 mi d 0.32223 1.58529 1.58875 1.59080 6.02097- 0.10009: Tn f f d|3= 1.14640-f It will be understood that this invention is susceptible to further modification and, accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claim.

What is claimed is:

for the yellow helium line d as n and the refractive index for the blue hydrogen line F as n and further where f is the focal length of the eyepiece and d is the distance measured along the optical axis of the eyepiece from the plane and the lens L the refractive index for the red hydrogen line C is designated as n the refractive index 5 leading face of the first lens to the real image projected A wide-angle eyepiece comprising four components in by an objective and 11 is the distance measured along the axial alignment with each other, the first component being optical axis between the last face of the last lens and the of dispersive effect and positioned in front of a real image pupil of the eye. projected by an objective used in cooperative relationship and in axial alignment with the components of said eye- 10 References Clted y the Examine! piece, the second component having a light-collecting ef- UNITED STATES PATENTS feet and positioned in the vicinity of the real image projected by an objective, the third and fourth components 1,468,762 9/1923 Taylor et al. also having a light-collecting effect, the eyepiece having 2,423,676 7/1947 Altman 88-57 the following numerical data: 15 2,829,560 8/ 1958 Tackaberry et al 88-57 Lens Radius of curve.- Curvature Distance and n nd 11;:

ture spacing d =0.65094-f =-1.09592-/ 0.5893l:f L d1 0.19830 1. 75305 1.76180 1.78190 1 =-1.010s2-f 0.98932:f d 0 r3 =1.01082 f 0.98932:f 2 L 1 d 0.05197; 1. 48584 1.48749 1.49230 n =+1.20137-/ +0.83236zf d4 0.83076-f B image plane d5 0.02253; r,=+16.48775-f +0.06065zj' Lm-. d 0.78220; 1. 50575 1.56883 1.57590 r =1.49076-f 0.67078:f

. dr= 0.70024] 7 =+3A3493-f +0.291132f Liv..- d5 0.09295] 1.77607 1.78470 1. 80613 r8 =+1.23644-f +0.808801f d 0 1.23644- 0.80880: L n f f tim= 0.81178] 1.58518 1.58784 1.59380 rw=3,10576-f 0.32198:f

+153432f +0 05170- 022928.] Lv;. m 6'02097 d11= 0.322234 1. 58529 1.58875 1.59680 mfll- 'f d13= 1.14540;

wherein the lenses are designated as L; L the FOREIGN PATENTS radii of curvature as r r the distances and spac- 137,281 8/1960 Russia ings as d d with the distance d; representing the spacing between u and the real image plane and the JEWELL H. PEDERSEN, Primary Examiner. tance d representing the spacing between the real image 45 FREDERICK M. STRADER, Examiner. I. K. CORBIN, R. I. STERN, Assistant Examiners. 

